/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/**
 *
 * @filename: multi_update.h
 */


#ifndef _MULTI_UPDATE_H_
#define _MULTI_UPDATE_H_


class multi_update :public select_result_interceptor
{
  TableList *all_tables; /* query/update command tables */
  TableList *leaves;     /* list of leves of join table tree */
  TableList *update_tables, *table_being_updated;
  Table **tmp_tables, *main_table, *table_to_update;
  Tmp_Table_Param *tmp_table_param;
  ha_rows updated, found;
  List <Item> *fields, *values;
  List <Item> **fields_for_table, **values_for_table;
  uint32_t table_count;
  /*
   List of tables referenced in the CHECK OPTION condition of
   the updated view excluding the updated table.
  */
  List <Table> unupdated_check_opt_tables;
  Copy_field *copy_field;
  enum enum_duplicates handle_duplicates;
  bool do_update, trans_safe;
  /* True if the update operation has made a change in a transactional table */
  bool transactional_tables;
  bool ignore;
  /*
     error handling (rollback and binlogging) can happen in send_eof()
     so that afterward send_error() needs to find out that.
  */
  bool error_handled;

public:
  multi_update(TableList *ut, TableList *leaves_list,
	           List<Item> *fields, List<Item> *values,
	           enum_duplicates handle_duplicates,
	           bool ignore);
  ~multi_update();
  int prepare(List<Item> &list, Select_Lex_Unit *u);
  bool send_data(List<Item> &items);
  bool initialize_tables (JOIN *join);
  void send_error(uint32_t errcode,const char *err);
  int  do_updates();
  bool send_eof();
  virtual void abort();
};

#endif /* _MULTI_UPDATE_H_ */
